Mine drill



Dec. 9, 1924.

J. w. CAMPBELL MINE DRILL Filed Jan. 12. 1923 2 Sheets-Sheet l l/YVEA/TR PilllllanMn Dec". 9, 1924.

J. W. CAMPBELL MINE DRILL Filed Jah. 12. 1923 2 sheets-sheet 2 /Nvvrok www' Patented Dec. 9, 1924.

UNTED STATES JACOB W. GAMPBELI, OF WENDEL, PENNSYLVANIA.

MINE DRILL.

Application filed January 12, 1923.

To all whom t may concern:

Be it known that I, JACOB W. CMrBELL, residing at IVendel, in the county of Westmoreland and State of Pennsylvania, a citi- Zen of the United States, have invented or discovered certain new and'useful Improvements in Mine Drills, of which improvement the following is a specification.

My invention relates to the construction of mine drills and, specifically, to a drill which, being mounted for example on a coal-mining` machine, may be employed for drilling` blast holes in the breast of coal opposite which the mining machine is brought, and which the mining machine itself is adapted to undercut.

In the accon'ipanyingdrawings I show the drill mechanism in which my invention consists. In these drawings Figure I is a view in plan from above of the apparatus; Fig. II is a view of it in side elevation, Fig ure III is a view in transverse vertical section, on the plane indicated at III-III, Fig. I; Figure IV is a similar view on a plane indicated at IV-IV, Fig. I; Figure V is a view similar to Fig. I, illustrating a modilication.

Describing first the machine as it is shown in Figs. I to IV, inclusive, the vbed plate is indicated by the reference'numeral 1. The machine may upon thisbed plate be mounted wherever desired, but as I have already intimated, it ordinarily will be mounted upon the deck of a coal-mining machine. I have not in the drawings shown the coalmining machine, with my drilling appara* tus applied to it, but the arrangement will be understood from what I have said without any such additional showing.

Upon the bed plate 1 of the machine a frame 2 is pivoted at 3. This frame is elongate for purposes presently to be described. The frame may be swung on its pivot 3 and raised and lowered to direct the drill which extends longitudinally from and beyond the end of the frame at any angle which may be desired. Racks and pinions 4; and 5 are provided, the racks pivoted to the bed plate 1, the pinions rotatable in the frame 2, and by means of the racks and pin` ions the frame may be swung on its pivot. The pinions 5 are turned by the hand crank 6. More minutely, a pair of plates 30 rigidly mounted on frame 2 afford opposite bearings for the shaft which constitutes the common axle of the two pinions 5. These Serial No. 612,235.

plates 80, additionally, carry pivoted to them, keepers 20, and through keepers 2O the racks 4 extend. In operation the keepers turn slightly on their pivots as the frame swings on its pivot 3, and they are eective to hold the racks to engagement with the :1

pinions.

A pair of screws 21 extend longitudinally of the frame and a carriage 14; threaded upon the screws is by the turning of the screws movable longitudinally of the frame.

A counter shaft 9 extends longitudinally i of frame 2. It passes through carriage 14, and pinion 11 is splined upon it, so that pinion 11 may range longitudinally along shaft 9, and at the saine time rotation of shaft 9 will etfectrotation of pinion 11, and consequent rotation of pinion 10 and shaft 8 and drill 7.

The shaft 9 is driven from a power shaft 12 through thebevel gearing 16, 17. The bevel gear 17 is, through the manually controlled clutch 13, capable of being integrated with the shaft 18 rotatably mounted on bed plate 1, and shaft 18 and shaft 9 are articulated together by the universal joint- 19. lThis universal joint is aligned with the pivots 3, and is effective to rotate the drill while frame 2 swings on the pivots 3.

The screws 21 are rotated by manually driven worm drive. rllhe crank arm of this worm drive is indicated at 15, and it will be understood that the turning of the crank will cause the turning of worms 23 which engage the worm pinions 22 with which the screws 21 are equipped.

So long as power is applied and shaft 12 is rotated the drill 7 may be set into rotation merely by the shifting and closing of the clutch 13, and, the clutch 13 being closed, and the shaft 12 rotated, the drill 7 will continue to rotate, whatever be the position of the frame. The attendant has at his hand two cranks 6 and 15 and, by turning one of them and the other, the frame may be swung so as to direct the drill at the desired angle and the carriage 14 may be advanced so as to cause the drill to engage and sink into the breast of coal or other body into which a hole is to be drilled.

The advantage of having manually operated elevating apparatus is that the attendant has the directing of the drill under his easy immediate control, and the advantage of having the forward feed of the drill under manual control is that when in the course of drilling the instrument strikes a harder body, the attendant, perceiving it, may adapt operation to the changed condition. It is common in drilling` appa v'atus in which the drill is advanced under mechanical power for drills to be broken when they encounter such hard bodies.

The machine of Figure V requires no more than a few words of further explanation. In this case the screws 21 are omitted, and instead endless ropes 25 engage the carriage 111-, and these endless ropes being Wrapped about a drum 2G, are driven by t-he rotation of the drum to effect the shifting of the carriage, and the drum is rotated by the crank arm 15 precisely as, in the machine of Figs. I to IV, the worm drive is effected by crank arm 15.

I claim as my invention:

1. In a drilling machine the combination of a bed plate, a frame pivoted to the bed plate, a shaft formed in two parts united by universal joint on the axis of the frame pivot and carried, the one part by the bed plate the other by the frame, a drill borne by a shaft and extensible from said frame, said drill shaft and the shaft first named being geared together, means for rotating the shaft first named, manually operated means for swinging the frame on its pivot, and

manually operated means for effecting extension of said drill shaft from said frame.

2. In a drilling machine the combination of a bed plate, a frame pivoted to said bed plate, manually operated means for causing the frame to swing on its pivot, a rarriage movable longitudinally of said frame, manually operated means for ellecting movement of said carriage along said frana), a

rotatable shaft borne by said frame and articulated to t-he shaft borne by the bed plate in a joint coaxial with the frame pivot, a rotatable drill shaft borne by said rarriage and throughout the range of carriage travel geared with the frame-borne shall, and means for rotating the shaft borne by the bed plate.

3. In a drilling machine the combination of a bed-plate, a frame pivoted to the bed plate, manually operated means for causing the frame to swing pivotally on the bed plate, a screw ext-ending longitudinally of the frame, a carriage movable longitudinally of said frame and threaded on said screw, manually operated means for turning the screw and effecting carriage movement, a shaft rotatably mounted on the bed plate, a shaft rotatably mounted in the frame and articulated to the tirst named shaft in a uuiversal joint coaxial with the frame pivot, a drill shaft borne by the carriage aud geared with the frame-borne shaft, and means for driving the first named shaft.

In testimony whereof I have heremito set my hand.

JACOB W. CAMPB ELL.

IVitnesses CLARENCE Maynas, JOHN MCCLURE. 

